feat: add typescript support

.github/workflows/types.yml

@@ -0,0 +1,29 @@
+name: TypeScript types
+
+on:
+  push:
+    branches: [master, main]
+    paths:
+      - 'ts/index.d.ts'
+      - 'index.js'
+      - 'ts/typings-check.ts'
+      - 'ts/tsconfig.json'
+      - '.github/workflows/types.yml'
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 24
+      - name: Install type-check dependencies
+        run: npm install --no-save typescript @types/node
+      - name: Check index.d.ts
+        run: npx tsc --project ts/tsconfig.json

package.json

@@ -3,6 +3,7 @@
   "version": "2.1.0",
   "description": "A DNS Server and Client Implementation in Pure JavaScript with no dependencies.",
   "main": "index.js",
+  "types": "ts/index.d.ts",
   "scripts": {
     "test": "node --test",
     "test:coverage": "node --test --experimental-test-coverage",